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        <blockquote>
<p>1.面向对象和面向过程？<br>  2.弱类型与强类型语言？<br>  3.松散型？<br>  4.如果变量被重新声明，但是没被赋值，这是值仍旧是最先的值</p>
</blockquote>
<hr>
<h2 id="JS-介绍"><a href="#JS-介绍" class="headerlink" title="JS 介绍"></a>JS 介绍</h2><hr>
<h3 id="1-JS是什么–"><a href="#1-JS是什么–" class="headerlink" title="1.JS是什么–"></a>1.JS是什么–</h3><p>Javascript是一种直译式脚本语言，是一种动态类型、弱类型、基于原型的解释语言，内置支持类型。也是一种面向对象语言。事件驱动。<br>JS难点主要在：语法的松散、浏览器兼容<br><a id="more"></a></p>
<ul>
<li>早期是为了做数据验证</li>
<li>将动态数据写入HTML（主要用ajax）</li>
<li>做动画特效</li>
<li>操作DOM读写HTML</li>
<li>……</li>
</ul>
<h3 id="2-JS组成–"><a href="#2-JS组成–" class="headerlink" title="2.JS组成–"></a>2.JS组成–</h3><ul>
<li>ECMAscript（语法规范）<br>数据类型、运算符、流程控制、函数、面向对象。。。  </li>
<li>DOM（document object model）</li>
<li>BOM（browser object model）</li>
</ul>
<h3 id="3-JS的引入方式（3-4-均不常用）"><a href="#3-JS的引入方式（3-4-均不常用）" class="headerlink" title="3.JS的引入方式（3.4.均不常用）"></a>3.JS的引入方式（3.4.均不常用）</h3><ol>
<li>内嵌<br><code>&lt;script&gt;&lt;/script&gt;</code>   </li>
<li>外链<br><code>&lt;script src=&quot;#&quot;&gt;&lt;/script&gt;</code>     </li>
<li>JS重定向<br><code>&lt;a href=&quot;javascript:#&quot;&gt;haha&lt;/a&gt;</code><br><code>还有表单重定向，表单数据先用JS做验证，符合要求在提交服务器</code>  </li>
<li>在事件后面调用</li>
</ol>
<h3 id="4-JS的输出工具"><a href="#4-JS的输出工具" class="headerlink" title="4.JS的输出工具"></a>4.JS的输出工具</h3><ol>
<li>alert（””）  </li>
<li>document.write(“”)  </li>
<li>prompt(“”)  返回一个字符串类型</li>
</ol>
<h3 id="5-JS注释"><a href="#5-JS注释" class="headerlink" title="5.JS注释"></a>5.JS注释</h3><ol>
<li><code>// 单行注释</code>  </li>
<li><code>/*注释内容*/ 多行注释</code></li>
</ol>
<h3 id="6-javascript变量"><a href="#6-javascript变量" class="headerlink" title="6.javascript变量"></a>6.javascript变量</h3><p>可以把变量当做一个存储数据的容器。它可以存储任何数据。<br>用关键字var来创建变量</p>
<ol>
<li>先声明后赋值<br><code>var a;   
 a=11;</code></li>
<li>声明并赋值<br><code>var b = &quot;love&quot;;</code></li>
<li>声明多个变量，在赋值<br><code>var a,b;
a=1;
b=2;</code></li>
<li>声明多个变量并赋值<br><code>var name=&quot;lesin&quot;,age=25;</code></li>
</ol>
<h3 id="7-javascript命名规范"><a href="#7-javascript命名规范" class="headerlink" title="7.javascript命名规范"></a>7.javascript命名规范</h3><ol>
<li>不能以关键字或者保留字命名</li>
<li>必须以字母或者_或者$开头</li>
<li>驼峰命名法（或者下划线隔开 ）</li>
<li>严格区分大小写，并且命名要有意义</li>
<li>分号表示一段功能体的结束</li>
</ol>
<h2 id="JS的数据类型"><a href="#JS的数据类型" class="headerlink" title="JS的数据类型"></a>JS的数据类型</h2><h3 id="1-基本类型"><a href="#1-基本类型" class="headerlink" title="1. 基本类型"></a>1. 基本类型</h3><ul>
<li><p>undefined<br>eg:<code>var hd;</code><br>声明变量但是不赋值，即为undefined  </p>
</li>
<li><p>Null<br>空对象</p>
</li>
<li><p>Number<br>浮点数（小数）和整数都是数值类型</p>
</li>
<li><p>String</p>
</li>
<li><p>Boolean 布尔值<br>只有真、假两个值</p>
</li>
</ul>
<h3 id="2-引用类型"><a href="#2-引用类型" class="headerlink" title="2. 引用类型"></a>2. 引用类型</h3><ul>
<li>object</li>
</ul>
<h2 id="JS的运算符-JS运算能力一般，一般不用来进行精准的计算"><a href="#JS的运算符-JS运算能力一般，一般不用来进行精准的计算" class="headerlink" title="JS的运算符(JS运算能力一般，一般不用来进行精准的计算)"></a>JS的运算符(JS运算能力一般，一般不用来进行精准的计算)</h2><ul>
<li>算术运算符<br><code>+、-、*、/、%、++、--</code><br>在算术运算中，++a（自私运算）,表示先自增，在运算；a++（无私运算）表示，先参与运算，在自增。</li>
<li>关系运算符（比较运算符）</li>
<li>赋值运算符</li>
<li><p>逻辑运算符  </p>
<blockquote>
<p>逻辑运算符在对任意数据运算时，会将其转化为布尔值<br>1.undefined     false<br>2.Null          false<br>3.Boolean       就是本身值<br>4.Number        除了0以外都是true<br>5.String        除了空字符串以外都是真<br>6.对象           真</p>
</blockquote>
</li>
<li><p>三元运算符  </p>
<blockquote>
<p>(条件)？条件为真的返回值：条件为假的返回值；  </p>
</blockquote>
</li>
</ul>
<h2 id="JS的流程控制"><a href="#JS的流程控制" class="headerlink" title="JS的流程控制"></a>JS的流程控制</h2><ol>
<li>顺序结构</li>
<li>选择结构<br>一个完整的if判断体，只要其中一个条件判断成功，剩余的都不判断  <pre><code>if(){
}else if(){
}else if(){
}
</code></pre>switch中，如果有一个条件成立，后面的判断不在判断，代码直接执行，所以需要break，跳出。<br>if用于范围判断，switch用于精准值判断</li>
<li>循环结构  <pre><code>for(var i =0;i&lt;1000;i++){
 document.write(&quot;hello hexo&quot;);
 }
</code></pre></li>
</ol>

      
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        <div style="text-align:center;color: #ccc;font-size:14px;">------本文结束<i class="fa fa-paw"></i>感谢阅读------</div>
    
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#JS-介绍"><span class="nav-number">1.</span> <span class="nav-text">JS 介绍</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#1-JS是什么–"><span class="nav-number">1.1.</span> <span class="nav-text">1.JS是什么–</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#2-JS组成–"><span class="nav-number">1.2.</span> <span class="nav-text">2.JS组成–</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#3-JS的引入方式（3-4-均不常用）"><span class="nav-number">1.3.</span> <span class="nav-text">3.JS的引入方式（3.4.均不常用）</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#4-JS的输出工具"><span class="nav-number">1.4.</span> <span class="nav-text">4.JS的输出工具</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#5-JS注释"><span class="nav-number">1.5.</span> <span class="nav-text">5.JS注释</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#6-javascript变量"><span class="nav-number">1.6.</span> <span class="nav-text">6.javascript变量</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#7-javascript命名规范"><span class="nav-number">1.7.</span> <span class="nav-text">7.javascript命名规范</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#JS的数据类型"><span class="nav-number">2.</span> <span class="nav-text">JS的数据类型</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#1-基本类型"><span class="nav-number">2.1.</span> <span class="nav-text">1. 基本类型</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#2-引用类型"><span class="nav-number">2.2.</span> <span class="nav-text">2. 引用类型</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#JS的运算符-JS运算能力一般，一般不用来进行精准的计算"><span class="nav-number">3.</span> <span class="nav-text">JS的运算符(JS运算能力一般，一般不用来进行精准的计算)</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#JS的流程控制"><span class="nav-number">4.</span> <span class="nav-text">JS的流程控制</span></a></li></ol></div>
            

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